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Table 3 Engineering prototype and experimental system design parameters

From: Effect of groundwater forced seepage on heat transfer characteristics of borehole heat exchangers

Classify Volume
x∙y∙z
(m3)
Pressure diaphragm thickness
σ1 (m)
Confined aquifer (fine sand layer) thickness
σ2 (m)
Tube pitch
l(m)
Heat transfer rates per unit borehole depth
q (W m−1)
Darcy velocity
uf
(m s−1)
Operation time
t
Prototype 20 × 16 × 20 4 12 4 50 1.2 × 10–7 90 days
Test-bed 1.0 × 0.8 × 1 0.2 0.6 0.2 50 2.4 × 10–6 5.4 h